pwm: dwc: access driver_data using dev_get_drvdata()

Now that we're setting driver_data using dev_set_drvdata(), we can use
dev_get_drvdata() for accessing it.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240212130247.9985-6-raag.jadav@intel.com


Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>